Replacing Cutterhead Knives - Grizzly G0725 Owner's Manual

Replacing
Cutterhead Knives
The Model G0725 jointer has a dual-knife
cutterhead. Under normal operation these knives
will become dull and need to be sharpened or
replaced. Refer to Troubleshooting (Page 35) to
determine if the knives may be dull.
You can order new knives or a knife hone from
Grizzly, see Accessories on Page 31.
To replace cutterhead knives:
1. DISCONNECT JOINTER FROM POWER.
2. Carefully rotate the cutterhead until clamp
screws are accessible.
Cutterhead knives are sharp. Use caution
when handling cutterhead knives. Use
gloves to reduce the risk of injury.
3.
Remove the four cutterhead clamp screws
fastening the knife to cutterhead (see
Figure 47). Carefully remove the knife and
clamp from cutterhead.
Cutterhead
Clamp Screws
Figure 47. Cutterhead knife clamp screws.
4. Repeat Steps 1–3 for the second cutterhead
knife.
5.
Clean the cutterhead thoroughly before
installing new knives or re-installing sharp-
ened knives.
Model G0725 (Mfd. Since 03/18)
6. Install the knife and clamp in the cutterhead
and slightly tighten each of the clamp screws
in sequence, as shown in Figure 48.
3 1
Figure 48. Clamp screw tightening sequence.
Note: By tightening the clamp screws out of
sequence, the shape of the knife may be
affected, hampering the jointing capabilities
of the machine. Following the tightening
sequence reduces that possibility.
7. Repeat Steps 6 for the second cutterhead
knife.
8.
Check the alignment of the knives to the
outfeed table. They must be parallel. If the
knife is not parallel to the outfeed table, use
the knife adjustment jack screws (see Figure
18) to fine tune the position of the knife. Refer
to Checking Outfeed Table Alignment on
Page 17 for detailed instructions for adjusting
the position of the knife.
Knife
Adjustment
Jack
Screws
Figure 49. Knife adjustment jack screws.
9.
Following the tightening sequence (Figure
51), final tighten each of the clamp screws.
10. Return the cutterhead guard to the operating
position and ensure it is working properly.
Re-align the fence and tables as needed.
Test the jointer on a piece of scrap material.
2 4
-37-